“I usually start my day off with a cup of detox tea,” said Jenner. “I have, like, 12 cups a day.”

In addition to tea, the super-skinny Kendall stays supermodel skinny by following a low carb Paleo style diet that features lean proteins, vegetables and low-sugar fruits like apples and strawberries.

For exercise, the gorgeous brunette prefers cardio exercise. “I like running,” she shared. “I’ve been trying to get back into it.”

Her beauty secret (aside from great genes) includes plenty of sleep. “My beauty secret for fashion week is just getting a good amount of sleep,” said Kendall. “I feel like I at least need about seven hours, eight hours of sleep to function.”

While the Paleo diet has been touted as a weight-loss tool, the diet’s creator, Dr. Loren Cordain, said the eating plan was originally intended to prevent disease.

“The idea we had had little to do with weight control,” said Dr. Cordain, author of The Paleo Answer. “We were more interested in cardiovascular effects, cancer, acne and myopia. It is a lifelong way of eating to reduce the risk of chronic disease.”

Dr. Cordain, who also wrote The Paleo Diet Cookbook, said marketing the Paleo diet as a weight-loss tool was his editor’s idea, to make the diet appeal to a larger audience. Despite his initial reluctance to push Paleo as a weight loss plan, recent studies show it beats almost every other diet for weight loss.

Kendall’s entire family has generated headlines for the past few months. Her younger sister, Kylie Jenner, was accused of getting lip injections and other plastic surgery. Sources say Kylie, 17, got the cosmetic procedures to look more like Kendall.

And Kendall’s parents, Bruce and Kris Jenner, recently filed for divorce following months of speculation that Bruce is allegedly seeking a sex change operation to become a woman.